KABUL, Afghanistan — The Taliban confirmed the death of longtime leader Mullah Mohammad Omar and appointed his successor Thursday, as a new round of peace talks was indefinitely postponed amid concerns over how committed the new leadership is to ending the militant group’s 14-year insurgency.

The Afghan Taliban Shura, or Supreme Council, chose Mullah Omar’s deputy, Mullah Akhtar Mansoor, as its new leader, two Taliban figures told The Associated Press, saying the seven-member council had met in the Pakistani city of Quetta.

Mansoor is considered close to Pakistani authorities who hosted peace talks earlier this month, and his election could widen an internal split between fighters who favor negotiations with the Afghan government and those who want to continue an insurgency that has gained speed following the end of the international combat mission last year.

Mansoor has effectively commanded the movement for the three years since Mullah Omar’s previous deputy, Mullah Abdul Baradar, was arrested by Pakistani authorities.